The termoption command allows you to change the behaviour of the current terminal without requiring a new terminal command. Only one option can be changed per command, and only a small number of options can be changed this way. Currently the only options accepted are
set termoption {no}enhanced
set termoption font "<fontname>{,<fontsize>}"
set termoption {solid|dashed}
set termoption {linewidth <lw>}{lw <lw>}